mrtonka@aol.com (MRTONKA) writes:
>>Has anyone heard of cases where motor operated fuel valves (ball, gate or
>>butterfly) jammed internally due to ice caused by excessive water in the
>>fuel (JP4 or kerosene) freezing during flight at high altitude?
Yes the fuel tank selector valves on the DC-8-60 series will do this
on the ground in extreme temps. It is a 3 way ball valve.